Debt (Detail)		3 Months Ended	12 Months Ended
	Jun. 01, 2017 USD ($)	May 31, 2017 USD ($)	Dec. 31, 2017 USD ($)
Credit Facility 2017 | London Interbank Offered Rate (LIBOR)
Line of Credit Facility [Line Items]
Basis spread on variable interest rate			3.75%
Credit Facility 2017 | London Interbank Offered Rate (LIBOR) | Minimum
Line of Credit Facility [Line Items]
Basis spread on variable interest rate			3.50%
Credit Facility 2017 | London Interbank Offered Rate (LIBOR) | Maximum
Line of Credit Facility [Line Items]
Basis spread on variable interest rate			3.75%
Credit Facility 2017 | Base Rate
Line of Credit Facility [Line Items]
Basis spread on variable interest rate			2.75%
Credit Facility 2017 | Base Rate | Minimum
Line of Credit Facility [Line Items]
Basis spread on variable interest rate			2.50%
Credit Facility 2017 | Base Rate | Maximum
Line of Credit Facility [Line Items]
Basis spread on variable interest rate			2.75%
Term Loan | Credit Facility 2017
Line of Credit Facility [Line Items]
Maximum borrowing capacity	$ 260,000,000.0
Debt term	7 years
Amount outstanding			$ 259,400,000
Premium due if prepaid in connection with repricing transaction within six months of credit agreement closing			1.00%
Delayed draw fee		$ 1,200,000
Annual principal payment, percentage of principal			1.00%
Amount required to be prepaid, percent of excess cash flow			50.00%
Term Loan | Credit Facility 2017 | London Interbank Offered Rate (LIBOR)
Line of Credit Facility [Line Items]
Basis spread on variable rate, floor			0.75%
Revolving Credit Facility | Credit Facility 2017
Line of Credit Facility [Line Items]
Maximum borrowing capacity	$ 100,000,000.0
Debt term	5 years
Amount outstanding			$ 0
Potential additional borrowing capacity	$ 75,000,000.0
Potential increase in borrowing capacity, pro forma leverage ratio used for calculation	1.75
Commitment fee on undrawn amounts			0.50%
Revolving Credit Facility | Credit Facility 2017 | Minimum
Line of Credit Facility [Line Items]
Commitment fee on undrawn amounts			0.375%
Revolving Credit Facility | Credit Facility 2017 | Maximum
Line of Credit Facility [Line Items]
Commitment fee on undrawn amounts			0.50%
Revolving Credit Facility | Credit Facility 2017 | London Interbank Offered Rate (LIBOR)
Line of Credit Facility [Line Items]
Basis spread on variable rate, floor			0.00%
Revolving Credit Facility | Credit Facility
Line of Credit Facility [Line Items]
Write off of deferred debt issuance cost			$ 1,100,000
Leverage Ratio Below 1.00 | Term Loan | Credit Facility 2017
Line of Credit Facility [Line Items]
Amount required to be prepaid, percent of excess cash flow			25.00%
Leverage Ratio Below 0.50 | Term Loan | Credit Facility 2017
Line of Credit Facility [Line Items]
Amount required to be prepaid, percent of excess cash flow			0.00%